README for week4 lab blockmole provides the following steps:

Kör i linuxterminal med detta kommando:

scala -cp "introprog.jar:." Main

Om du kör i Windows Powershell eller Cmd byt kolon mot semikolon i kommandona ovan.

But should probably be scala -cp "introprog.jar:." run, since we're using

// hello-window.scala

@main
def run(): Unit =
...

At least the former doesn't work for me, but the latter does. :-)

Submitting a PR for this, feel free to reject if not applicable.